The Couple System was introduced in English Flyff during the version 13 upgrade and allows players to earn extra power ups for their characters.
When couples stay together on the same channel, their couple experience grows. Your activities online don't change how much experience you get. It takes about 3.75 days to level up, and 90 days to reach level 21. Skills unlock automatically at certain levels and work when your partner is on the same channel. These skills aren't buffs; they're displayed at the top right of your screen, alongside items like FLY cards, Upcut Stones, and Medicine.